Good to hear your Boston friend survived 3 hits from a 45 and then drove himself to a hospital to get patched up. Impressive if not amazing.
I use the 45ACP cartridge not because it has a tendency to drop assailants quickly, not because it propels a large bullet, and not because it has a devastating reputation...
I shoot the 45 ACP (preferably thru a 4" S&W revolver barrel) because (for me) it is VERY ACCURATE and in a gunfight ACCURACY RULES.
PS The 9mm is an excellent cartridge, for some bizarre reason takes more effort (for me) to get accuracy.
For 20 years the sea was my home, always recall the sun going down, and my trusty friend, a 1911 pistol, strapped to my side.